搅拌釜内高固含率搅拌功率的实验测量及模拟预测  

Simulation and experimental study on stirring power of stirred tanks with high solid volume fractions

作　　者：张琳伟 陈冰冰[1,2,3] 陈律名 张玮[1,2] ZHANG Linwei;CHEN Bingbing;CHEN Lyuming;ZHANG Wei(Institute of Process Equipment and Control Engineering,Zhejiang University of Technology,Hangzhou 310023,China;Key Laboratory for Green Pharmaceutical Technologies and Related Equipment of Ministry of Education,Zhejiang University of Technology,Hangzhou 310023,China;College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310023,China)

机构地区：[1]浙江工业大学化工机械设计研究所,浙江杭州310023 [2]绿色制药技术与装备教育部重点实验室,浙江杭州310023 [3]浙江工业大学机械工程学院,浙江杭州310023

出　　处：《高校化学工程学报》2025年第1期54-63,共10页Journal of Chemical Engineering of Chinese Universities

摘　　要：为了提高搅拌釜中高固含率工况下固-液两相搅拌功率的数值模拟预测精度,通过流变仪探究了固含率及剪切速率对甘油-聚甲基丙烯酸甲酯(PMMA)固-液两相体系黏度的影响,基于实验结果提出了考虑固含率与剪切速率影响的固-液两相体系黏度计算模型,并与计算流体力学(CFD)方法结合,对搅拌釜内固含率为0.1~0.4的固-液搅拌功率进行预测。结果表明,随着固含率的增大,尤其是当固含率大于0.2时,甘油-PMMA固-液两相体系呈现出明显的非牛顿流体特征。目前广泛使用的基于颗粒动力学理论的固-液两相体系黏度模型,会使CFD预测的搅拌功率随固含率增加而减小。与提出的固-液两相体系黏度模型结合后的CFD模拟,明显提高了搅拌釜内高固含率下对固-液搅拌功率的预测精度,且固相分布的模拟与实验结果具有较好的一致性。In order to improve the accuracy of power predictions of solid-liquid stirred tanks under high solid volume fraction conditions,effects of solid volume fraction and shear rate on the glycerolpolymethyl methacrylate(PMMA)solid-liquid two-phase system were investigated by a rheometer.A new viscosity model of solid-liquid two-phase system was proposed based on experimental results.A CFD model coupled with the proposed model was used to study the stirring power of solid-liquid stirred tank at high solid volume fractions(0.1-0.4).The results indicate that with the increase of solid volume fraction(especially over 0.2),the solid-liquid two-phase system shows non-Newtonian fluid characteristics.The stirred power predicted by CFD simulations coupled with the viscosity of solid-liquid two-phase system derived from the kinetic theory of granular flows(KTGF)are found to be negatively proportional to the solid phase volume fraction,which is inconsistent with the experimental findings.The CFD simulation combined with the proposed model significantly improves the prediction accuracy of solid-liquid mixing power in stirred tank under high solid volume fraction,and the simulation of solid phase distribution shows good consistency with the experimental results.

关 键 词：搅拌釜 高固含率 固-液两相体系黏度 计算流体力学 搅拌功率 

分 类 号：TQ027.2[化学工程]